The NASA Scientist Who Invented the Super Soaker

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mantra = here a statement or slogan repeated frequently

classified = (of information or documents) designated as officially secret and accessible only to authorized people

top secret = the highest level of classified information

run into a challenge = experience difficulties

a way better = much better

nozzle = a narrow piece attached to the end of a tube so that the liquid or air that comes out can be directed in a particular way

machine = make or operate on with a machine

EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.